How popular is Kornelija?

Kornelija is an uncommonly occurring given name for females. Kornelija is an equally uncommon surname for all people. (2000 U.S. DEMOGRAPHICS)

Which version is better?

The only prominent alternative form of Kornelija (NOT RANKED) is Cornelia. Other forms, like Kornelya, are uncommon. This relation of Kornelija reached the peak of its popularity 136 years ago (ADOPTION OF 0.1%), but now, Cornelia has become less fashionable. (TOP BABY NAMES, 2016)